First step towards implementing stack map descriptions for the optimizing compiler.

vm/bitmap_test.cc

Index: vm/bitmap_test.cc
===================================================================
--- vm/bitmap_test.cc	(revision 0)
+++ vm/bitmap_test.cc	(revision 0)
@@ -0,0 +1,105 @@
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#include "platform/assert.h"
+#include "vm/bitmap.h"
+#include "vm/object.h"
+#include "vm/unit_test.h"
+
+namespace dart {
+
+TEST_CASE(BitmapBuilder) {
+  // Test basic bit map builder operations.
+  BitmapBuilder* bmap1_builder = new BitmapBuilder();
+
+  EXPECT_EQ(-1, bmap1_builder->Maximum());
+  EXPECT_EQ(-1, bmap1_builder->Minimum());
+
+  bool value = true;
+  for (int32_t i = 0; i < 128; i++) {
+    bmap1_builder->Set(i, value);
+    value = !value;
+  }
+  value = true;
+  for (int32_t i = 0; i < 128; i++) {
+    EXPECT_EQ(value, bmap1_builder->Get(i));
+    value = !value;
+  }
+  value = true;
+  for (int32_t i = 0; i < 1024; i++) {
+    bmap1_builder->Set(i, value);
+    value = !value;
+  }
+  value = true;
+  for (int32_t i = 0; i < 1024; i++) {
+    EXPECT_EQ(value, bmap1_builder->Get(i));
+    value = !value;
+  }
+  // Create a Bitmap object from the builder and verify it's contents.
+  const Stackmap& bmap1 = Stackmap::Handle(
+      Stackmap::New(0, Code::Handle(), bmap1_builder));
+  EXPECT_EQ(1022, bmap1_builder->Maximum());
+  EXPECT_EQ(0, bmap1_builder->Minimum());
+  OS::Print("%s\n", bmap1.ToCString());
+  value = true;
+  for (int32_t i = 0; i < 1024; i++) {
+    EXPECT_EQ(value, bmap1.IsObject(i));
+    value = !value;
+  }
+  EXPECT(!bmap1.IsObject(2056));  // Out of range so returns false.
+
+  // Test the SetRange function in the builder.
+  bmap1_builder->SetRange(0, 256, false);
+  bmap1_builder->SetRange(257, 1024, true);
+  bmap1_builder->SetRange(1025, 2048, false);
+  for (int32_t i = 0; i <= 256; i++) {
+    EXPECT(!bmap1_builder->Get(i));
+  }
+  for (int32_t i = 257; i <= 1024; i++) {
+    EXPECT(bmap1_builder->Get(i));
+  }
+  for (int32_t i = 1025; i <= 2048; i++) {
+    EXPECT(!bmap1_builder->Get(i));
+  }
+  const Stackmap& bmap2 = Stackmap::Handle(
+      Stackmap::New(0, Code::Handle(), bmap1_builder));
+  EXPECT_EQ(1024, bmap1_builder->Maximum());
+  EXPECT_EQ(257, bmap1_builder->Minimum());
+  for (int32_t i = 0; i <= 256; i++) {
+    EXPECT(!bmap2.IsObject(i));
+  }
+  for (int32_t i = 257; i <= 1024; i++) {
+    EXPECT(bmap2.IsObject(i));
+  }
+  for (int32_t i = 1025; i <= 2048; i++) {
+    EXPECT(!bmap2.IsObject(i));
+  }
+
+  // Test the functionality to copy a Stackmap object into a builder.
+  BitmapBuilder* bmap2_builder = new BitmapBuilder();
+  bmap2_builder->SetBits(bmap1);
+  EXPECT_EQ(1022, bmap2_builder->Maximum());
+  EXPECT_EQ(0, bmap2_builder->Minimum());
+  value = true;
+  for (int32_t i = 0; i < 1024; i++) {
+    EXPECT_EQ(value, bmap2_builder->Get(i));
+    value = !value;
+  }
+
+  BitmapBuilder* bmap3_builder = new BitmapBuilder();
+  bmap3_builder->SetBits(bmap2);
+  EXPECT_EQ(1024, bmap3_builder->Maximum());
+  EXPECT_EQ(257, bmap3_builder->Minimum());
+  for (int32_t i = 0; i <= 256; i++) {
+    EXPECT(!bmap3_builder->Get(i));
+  }
+  for (int32_t i = 257; i <= 1024; i++) {
+    EXPECT(bmap3_builder->Get(i));
+  }
+  for (int32_t i = 1025; i <= 2048; i++) {
+    EXPECT(!bmap3_builder->Get(i));
+  }
+}
+
+}  // namespace dart